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public static void main(String[] args) {
String str = "abc aa a aa adfda a";
str = str.replaceAll("\\s+", " ");
System.out.println(str);
}
s=s.replaceAll(" +"," ");
.replace(" ","")
String words;
String newWords = words.replaceAll(" {2,}", " ");
String s = "d dd ddd dddd ddddd dddddd";
while (s.indexOf(" ") >= 0)
{
s = s.replaceAll(" ", " ");
}
System.out.println(s);